You rotate tensioner dial but thread tension does not change at all ? Is the tension number still the same? Cut the thread a few inches from the spool and pull it through the needle. On machines with hidden tension disks, there are usually electronics controlling the tension on the disks. The tension discs squeeze the thread as it passes between them, while the tension regulator controls the amount of pressure on the discs. Parts of thread tensioner of old sewing machine The most common cause of a sewing machine skipping stitches is using the wrong type of needle for the fabric you are sewing. When the presser foot is down, the tension is engaged and it will not allow the thread to seat as it should. In this case need loosen a set screw and pull out the tension assembly. This can be caused if the top thread tension is too tight, or if the bobbin thread is not in the bobbin case tension. Many newer sewing machines have the disks hidden inside the machine casing. As long as the presser foot is up, the thread can seat properly.
And before that, it seemed to be sewing just fine. Then re-thread it, taking care to engage the upper thread completely in the tension discs. Sometimes when I finish sewing a seam and take the fabric out, the top thread is stuck so tightly in the tension area that if I try to pull it to get a few inches of thread (so I can cut off the finished piece), the needle actually starts to bend. A little trick: Hold the thread on either side of the tension disc, then slide it back and forth a bit between the plates with a flossing motion. Tensions disks control the amount of pressure applied to the thread for an even feed to the machine needle causing an evenly formed stitch. In this position both tension discs should not push top thread and vice versa. If the thread is not seated in the tension disks, it cannot engage any tension on the thread and stitch malfunctions are bound to happen.
To loosen the screw it has to be rotated to left. Check that the upper thread is feeding freely without obstruction (like getting stuck behind the spool cap or getting caught on any rough spots o the thread spool itself). On older machines, there are only two tension discs, controlled by a screw or knob. If Bobbin Thread Is Showing on the Top of the Fabric.
Make sure the pressure foot is up (disengages tension) and maybe run a piece of dental floss through to see if any fluff or thread is in there. Grip it with fingers and pull towards you. Is there maybe a piece of thread stuck in the disc? Take off the thread tension assembly.
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